He did his tests on 100 different AES keys the success rate was 100% for AES-128 keys and 86% for AES-256 keys. The tool is being executed on one virtual machine while the attack is run from another virtual machine on a sibling thread of the same CPU core. Moghimi has shown an attack aimed at the Advanced Encryption Standard executed by the OpenSSL command line tool. The scenarios enable different types of data theft. Downfall vulnerability exploitation scenariosĪ few Downfall vulnerability exploitation scenarios have been tested successfully and provided by Moghimi in his research paper, in addition to showing videos of it on his website. This reporting is inline with the coordinated vulnerability disclosure practice in which a vulnerability is publicly disclosed only after mitigations are available. The Downfall vulnerability was first reported to Intel in August 2022 and kept under embargo until it was fixed. Intel released technical documentation on Gather Data Sampling, the name used by the company to refer to Downfall. Moghimi published a detailed account of his research about the vulnerability, as well as the full Downfall source code. More specifically, the researcher ” … discovered that the Gather instruction, meant to speed up accessing scattered data in memory, leaks the content of the internal vector register file during speculative execution.” He also stated that “The Gather instruction appears to use a temporal buffer shared across sibling CPU threads, and it transiently forwards data to later dependent instructions, and the data belongs to a different process and gather execution running on the same core.” New Malware Targets 97 Browser Variants, 76 Crypto Wallets & 19 Password Managers How Generative AI is a Game Changer for Cloud Security Must-read security coverageĨ Best Penetration Testing Tools and Software for 2023Ħ Best Cybersecurity Certifications of 2023 Untrusted software could therefore access data stored by other software, which shouldn’t be possible. Successful exploitation reveals internal hardware registers to software. The Intel advisory reports that CVE-2022-40982/Downfall is a hardware information disclosure vulnerability with medium severity.Īccording to Moghimi, the vulnerability is located in memory optimization features in Intel’s processors.
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